Hoping you LX experts can help a noob unravel a mystery.

Been watching as LX releases award seats through Dec 2021 & into Jan 2022 for a Southeast Asia - ZRH flight in Jan 2022. Most domestic and international routes have released award availability up to Jan 9 2022 (as of today) including for example HKG-ZRH, NRT-ZRH etc.
However, NO award space in 2022 on ANY dates have been released on the routes to ZRH from SIN, BKK & DEL - seats on those routes were release up to Dec 31 2021 but no further. Seats on those flights are still available for PURCHASE, just no seats at all released for redemption.

Any ideas what might be happening here? Randomness? Planned route changes? Thanks.